The Greggs Challenge is a challenge to see who can buy something from all the Greggs in a town or city the fastest
Kai: 'I wanna optimise the time I got for The Greggs Challenge Sam, wanna help?'
Sam: 'How does this work? Is it just all the Greggs as fast as possible?'
Kai: 'Yep'
Sam: 'Time for public transport%'